2009 Mercedes SLR McLaren Owner's Manual - Page 149

Controls in detail Audio system Bass Regardless of operating mode, press the AUD key repeatedly until you see BASS on the display. Treble Regardless of operating mode, press the AUD key repeatedly until you see TREBLE on the display. Fader i Your vehicle may or may not have the fader function, depending on the vehicle equipment and model. Regardless of operating mode, press the AUD key repeatedly until you see FADER on the display. Press + or - key to increase or decrease level. or Press both + and - keys simultaneously to reset the Bass to its center (flat) level. or Press + or - key to increase or decrease level. Press F or R key to shift sound accordingly to the front or rear speakers. or Press both F and R keys simultaneously to reset the Fader to its center level. Press both + and - keys simultaneously to reset the Treble to its center (flat) level. 149